US3289769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well flow control device
Assignee: Koehring Co
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Filing: 1964-05-15
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Granted: 1966-12-06
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Expires: 1984-05-15
Abstract
No abstract record available.
Inventors
- 👤 Wayne F Nelson
- 👤 Gil R Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:32
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A WELL DEVICE ADAPTED FOR INSTALLATION IN A WELL STRING COMPRISING, A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE MADE UP IN A WELL STRING, AN ANNULAR VALVE SEAT IN SAID BODY SURROUNDING SAID FLOW-AWAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT AND A CLOSE FLOW UPWARDLY THROUGH SAID FLOWWAY, MEANS URGING SAID FLAPPER VALVE TOWARD SAID ANNULAR VALVE SEAT IN SAID BODY, AN ANNULAR ELEMENT POSITIONED WITHIN SAID BODY AND HAVING A CENTRAL BORE THERETHROUGH, SAID ANNULAR ELEMENT INCLUDING AN UPPER SLEEVE PORTION WHICH ENGAGES SAID FLAPPER VALVE TO HOLD SAID FLAPPER VALVE IN INACTIVE POSITION AND A RESILIENT SEAT PORTION DEFINING AN ANNULAR SEAT PROJECTING INTO SAID BORE THROUGH SAID ELEMENT, AND MEANS RELEASABLY SECURING SA ID ANNULAR ELEMENT TO SAID BODY WHEREBY SAID ELEMENT IS RELEASABLY HELD IN POSITION TO ENGAGE SAID FLAPPER VALVE AND UPON RELEASE TO ALLOW SAID ANNULAR ELEMENT TO MOVE TO A LOWER POSITION THEREBY ACTIVATING SAID FLAPPER VALVE.
Claim 2
Dependent Claim
161 words
A WELL DEVICE ADAPTED FOR INSTALLATION IN A WELL STRING COMPRISING, A BODY HAVING A FLOW-WAY THERETHROUGH AND ADAPTED TO BE MADE UP IN A WELL STRING, AN ANNULAR VALVE SEAT IN SAID BODY SURROUNDING SAID FLOW-AWAY, A FLAPPER VALVE ADAPTED TO ENGAGE SAID ANNULAR VALVE SEAT AND A CLOSE FLOW UPWARDLY THROUGH SAID FLOWWAY, MEANS URGING SAID FLAPPER VALVE TOWARD SAID ANNULAR VALVE SEAT IN SAID BODY, AN ANNULAR ELEMENT POSITIONED WITHIN SAID BODY AND HAVING A CENTRAL BORE THERETHROUGH, SAID ANNULAR ELEMENT INCLUDING AN UPPER SLEEVE PORTION WHICH ENGAGES SAID FLAPPER VALVE TO HOLD SAID FLAPPER VALVE IN INACTIVE POSITION AND A RESILIENT SEAT PORTION DEFINING AN ANNULAR SEAT PROJECTING INTO SAID BORE THROUGH SAID ELEMENT, AND MEANS RELEASABLY SECURING SA ID ANNULAR ELEMENT TO SAID BODY WHEREBY SAID ELEMENT IS RELEASABLY HELD IN POSITION TO ENGAGE SAID FLAPPER VALVE AND UPON RELEASE TO ALLOW SAID ANNULAR ELEMENT TO MOVE TO A LOWER POSITION THEREBY ACTIVATING SAID FLAPPER VALVE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |